//package iterator.sm_join_assign_src; 
//
//import global.*;
//import bufmgr.*;
//import diskmgr.*;
//import heap.*;
//
///**
// * A structure describing a tuple.
// * include a run number and the tuple
// */
//public class pnode {
//  /** which run does this tuple belong */
//  public int     run_num;
//
//  /** the tuple reference */
//  public Tuple   tuple;
//
//  /**
//   * class constructor, sets <code>run_num</code> to 0 and <code>tuple</code>
//   * to null.
//   */
//  public pnode() 
//  {
//    run_num = 0;  // this may need to be changed
//    tuple = null; 
//  }
//  
//  /**
//   * class constructor, sets <code>run_num</code> and <code>tuple</code>.
//   * @param runNum the run number
//   * @param t      the tuple
//   */
//  public pnode(int runNum, Tuple t) 
//  {
//    run_num = runNum;
//    tuple = t;
//  }
//  
//}

